<template>
  <div :class="className" :style="{ height: height, width: width }" />
</template>

<script>
import echarts from 'echarts'
require('echarts/theme/macarons') // echarts theme
import resize from './mixins/resize'
import { getChange } from "@/api/graduation"

export default {
  mixins: [resize],
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '400px'
    },
    autoResize: {
      type: Boolean,
      default: true
    },
    chartData: {
      type: Object,
      required: true
    }
  },
  data() {
    return {
      chart: null,
      bar: [],
      num: [],
      rate: []
    }
  },
  watch: {
    chartData: {
      deep: true,
      handler(val) {
        this.setOptions(val)
      }
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.initChart()
    })
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')

      getChange().then(res => {
        console.log(res)
        let tempbar = [], tempnum = [], temprate = []

        for (let i = 0; i < res.data.length; i++) {
          tempbar.push(res.data[i].year)
          tempnum.push(res.data[i].number)
          temprate.push((res.data[i].rate*100).toFixed(2))
        }


        this.setOptions(tempbar, tempnum, temprate)

      }).catch(err => {
        console.log(err)
      })


    },
    setOptions(bar, num, rate) {
      this.chart.setOption({
        xAxis: {
          data: bar,
          boundaryGap: false,
          axisTick: {
            show: false
          }
        },
        grid: {
          left: 20,
          right: 10,
          bottom: 20,
          top: 30,
          containLabel: true
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross'
          },
          padding: [5, 10]
        },
        yAxis: [
          {
            type: 'value',
            name: "毕业生数量(人)",
            nameLocation: "center",
            nameGap:35,
            nameRotate:90,
            axisTick: {
              show: false
            },
          }, {
            type: 'value',
            name: "就业率",
            nameGap:35,
            nameRotate:90,
            nameLocation: "center",
            axisLabel: {
              show: true,
              interval: 'auto',
              formatter: '{value} %'
            },
            axisTick: {
              show: false
            },
          }],
        legend: {
          data: ['毕业生数量', '就业率']
        },
        series: [{
          name: '毕业生数量', itemStyle: {
            normal: {
              color: '#FF005A',
              lineStyle: {
                color: '#FF005A',
                width: 2
              }
            }
          },
          yAxisIndex: 0,
          smooth: true,
          type: 'line',
          data: num,
          animationDuration: 2800,
          animationEasing: 'cubicInOut'
        },
        {
          name: '就业率',
          smooth: true,
          type: 'line',
          yAxisIndex: 1,
          itemStyle: {
            normal: {
              color: '#3888fa',
              lineStyle: {
                color: '#3888fa',
                width: 2
              },
              areaStyle: {
                color: '#f3f8ff'
              }
            }
          },
          data: rate,
          animationDuration: 2800,
          animationEasing: 'quadraticOut'
        }]
      })
    }
  }
}
</script>
